Requirements for a minor in Environmental Science include 20 hours:

Minor Requirements
ENVR 212The Dynamic Earth and Environment4
ENVR 231Environmental Law, Justice, and Development2
BIOL 242Diversity of Life: An Introduction to Zoology and Botany4
BIOL 351Ecology and Evolution4
ENVR 371Introduction to Geographic Information Systems2
or GEOL 371 Introduction to Geographic Information Systems
Select four additional credits with an ENVR or GEOL prefix4
Total Credits20